package Packaging_study;

public class Packagin2 {
    public static void main(String[] args) {
        Integer in =1;
        //把int类的数据自动装箱变成Integer
        Integer in2 = in +2;
        //相当于自动开箱变成int类型再进行运算
        System.out.println(in+"\n=======\n"+in2);
    }
}
